tests/drv_hangman: Open drm fd before doing anything
tests/drv_hangman: Open drm fd before doing anything

This way we correctly auto-skip instead of falling over the
lack of i915 debugfs files first and fail the testcase due to
that.

Signed-off-by: Daniel Vetter <c1b6782c4af8f0673da8923a0702a1832e5940f4@ffwll.ch>

tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools